Dolores levels up based on amount of healing done either from endrain, absorbing damage, or tp moves like Vampric Whip.
Leveling up seems to grant it access to Extremely Bad Breath
Fire element damage and correlating skillchains may white proc it, which levels it down and prevents the retaliation mechanic.
May retaliate against magic spells cast against it.
The chance of this happening varies directly with the distance the player is from the NM. The further from the NM you are, the higher the chance of the NM attacking.
Dazzling Dolores will run over to the player, use Bad Breath, and then run back to the previous target and use Vampiric Whip.
Tainting Breath and Bad Breath may be resisted via magic evasion boosts, such as Indi-Vex/Geo-Attunement, equipment, Miso Ramen, etc.